No, no ....
Current best practice is not to power off for short periods, like overnight , only for periods of over a week or so. Although I've found, after a good charging routine "educates" the battery, it still has a reasonable charge after more than this.
"Sleep" is exactly what the mode is for - so you don't have to keep powering off !
And the only thing that "keeps running" is the Sleep mode.
Powering on and off soon wrecks/ages the battery.
And don't charge until at least 2 bars to go, one is better, and use a wall charger. And don't worry too much about stopping it at the crack of dawn - you can't overcharge these batteries.
This way you do actually improve the holding capacity and performance.
On the other hand, it is possible for a computer to throw a wobbly and actually discharge A battery, and then it's Goodnight Irene.....
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